lim(x趋近于1)x^3-1/x-1
问题描述:
lim(x趋近于1)x^3-1/x-1
答
lim(x趋近于1) (x-1)(x^2+x+1)/(x-1)
=lim(x趋近于1) (x^2+x+1)
=3